package com.wceManage.manage.security;

import com.wceManage.beans.SysMenu;
import com.wceManage.beans.SysUser;
import com.wceManage.commons.util.SpringContextHolder;
import com.wceManage.manage.common.security.shiro.session.CacheSessionDAO;
import com.wceManage.manage.common.security.shiro.session.SessionDAO;
import com.wceManage.manage.common.web.Servlets;
import com.wceManage.manage.context.GlobalContext;
import com.wceManage.manage.servlet.ValidateCodeServlet;
import com.wceManage.manage.util.LogUtils;
import com.wceManage.manage.util.UserUtils;
import com.wceManage.manage.util.Utils;
import com.wceManage.services.SysUserService;
import org.apache.commons.lang3.StringUtils;
import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.AuthenticationInfo;
import org.apache.shiro.authc.AuthenticationToken;
import org.apache.shiro.authc.SimpleAuthenticationInfo;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.authz.Permission;
import org.apache.shiro.authz.SimpleAuthorizationInfo;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.session.Session;
import org.apache.shiro.subject.PrincipalCollection;
import org.apache.shiro.util.ByteSource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;

import javax.annotation.PostConstruct;
import java.io.Serializable;
import java.util.Collection;
import java.util.List;

/**
 * 系统安全认证实现类
 *
 */
@Service
public class SystemAuthorizingRealm extends AuthorizingRealm {

    private Logger logger = LoggerFactory.getLogger(getClass());

//	private SystemService systemService;

    private SysUserService sysUserService;

    private SessionDAO sessionDAO;

    /**
     * 认证回调函数, 登录时调用
     */
    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken authcToken) {
        UsernamePasswordToken token = (UsernamePasswordToken) authcToken;

        int activeSessionSize = getSessionDao().getActiveSessions(false).size();
        if (logger.isDebugEnabled()) {
            logger.debug("login submit, active session size: {}, username: {}", activeSessionSize, token.getUsername());
        }
        if (StringUtils.isBlank(token.getUsername())) {
            throw new AuthenticationException("msg:用户名为空, 请重试.");
        }
        // 校验登录验证码
        if (Utils.isValidateCodeLogin(token.getUsername(), false, false)) {
            Session session = UserUtils.getSession();
            String code = (String) session.getAttribute(ValidateCodeServlet.VALIDATE_CODE);
            if (token.getCaptcha() == null || !token.getCaptcha().toUpperCase().equals(code)) {
                throw new AuthenticationException("msg:验证码错误, 请重试.");
            }
        }
        // 校验用户名密码
        SysUserService userService = getSystemService();
        SysUser user = userService.queryUserByAccount(token.getUsername());

        if (user != null) {
            if (user.getDelFlag()) {
                throw new AuthenticationException("msg:该已帐号禁止登录.");
            }
            token.setSalt(user.getSalt());
            return new SimpleAuthenticationInfo(new Principal(user, token.isMobileLogin()),
                    user.getPassword(), ByteSource.Util.bytes(user.getSalt()), getName());
        } else {
            return null;
        }
    }

    /**
     * 授权查询回调函数, 进行鉴权但缓存中无用户的授权信息时调用
     */
    @Override
    protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principals) {
        Principal principal = (Principal) getAvailablePrincipal(principals);
        // 获取当前已登录的用户
        if (!GlobalContext.TRUE.equals(GlobalContext.getProperties("user.multiAccountLogin"))) {
            Collection<Session> sessions = getSessionDao().getActiveSessions(true, principal, UserUtils.getSession());
            if (sessions.size() > 0) {
                // 如果是登录进来的，则踢出已在线用户
                if (UserUtils.getSubject().isAuthenticated()) {
                    for (Session session : sessions) {
                        getSessionDao().delete(session);
                    }
                }
                // 记住我进来的，并且当前用户已登录，则退出当前用户提示信息。
                else {
                    UserUtils.getSubject().logout();
                    throw new AuthenticationException("msg:账号已在其它地方登录，请重新登录。");
                }
            }
        }
        SysUser user = getSystemService().queryUserByAccount(principal.getLoginName());
        if (user != null) {
            SimpleAuthorizationInfo info = new SimpleAuthorizationInfo();
            List<SysMenu> list = UserUtils.getMenuList();
            for (SysMenu resource : list) {
                if (StringUtils.isNotBlank(resource.getPermission())) {
                    // 添加基于Permission的权限信息
                    for (String permission : StringUtils.split(resource.getPermission(), ",")) {
                        info.addStringPermission(permission);
                    }
                }
            }
//			// 添加用户权限
            info.addStringPermission("user");

//            getSystemService().updateLoginTimes(user);
//			// 记录登录日志
            LogUtils.saveLog(Servlets.getRequest(), "系统登录");
            return info;
        } else {
            return null;
        }
    }

    @Override
    protected void checkPermission(Permission permission, AuthorizationInfo info) {
        authorizationValidate(permission);
        super.checkPermission(permission, info);
    }

    @Override
    protected boolean[] isPermitted(List<Permission> permissions, AuthorizationInfo info) {
        if (permissions != null && !permissions.isEmpty()) {
            for (Permission permission : permissions) {
                authorizationValidate(permission);
            }
        }
        return super.isPermitted(permissions, info);
    }

    @Override
    public boolean isPermitted(PrincipalCollection principals, Permission permission) {
        authorizationValidate(permission);
        return super.isPermitted(principals, permission);
    }

    @Override
    protected boolean isPermittedAll(Collection<Permission> permissions, AuthorizationInfo info) {
        if (permissions != null && !permissions.isEmpty()) {
            for (Permission permission : permissions) {
                authorizationValidate(permission);
            }
        }
        return super.isPermittedAll(permissions, info);
    }

    /**
     * 授权验证方法
     *
     * @param permission
     */
    private void authorizationValidate(Permission permission) {
        // 模块授权预留接口
    }

    /**
     * 设定密码校验的Hash算法与迭代次数
     */
    @PostConstruct
    public void initCredentialsMatcher() {
        setCredentialsMatcher(new CustomCredentialsMatcher());
    }

    /**
     * 清空所有关联认证
     *
     * @Deprecated 不需要清空，授权缓存保存到session中
     */
    @Deprecated
    public void clearAllCachedAuthorizationInfo() {
//		Cache<Object, AuthorizationInfo> cache = getAuthorizationCache();
//		if (cache != null) {
//			for (Object key : cache.keys()) {
//				cache.remove(key);
//			}
//		}
    }

    /**
     * 获取系统业务对象
     */
    public SysUserService getSystemService() {
        if (sysUserService == null) {
            sysUserService = SpringContextHolder.getBean(SysUserService.class);
        }
        return sysUserService;
    }

    public SessionDAO getSessionDao() {
        if (sessionDAO == null) {
            sessionDAO = new CacheSessionDAO();
        }
        return sessionDAO;
    }

    /**
     * 授权用户信息
     */
    public static class Principal implements Serializable {

        private static final long serialVersionUID = 1L;

        private Long id; // 编号
        private String loginName; // 登录名
        private String name; // 姓名
        private boolean mobileLogin; // 是否手机登录

//		private Map<String, Object> cacheMap;

        public Principal(SysUser user, boolean mobileLogin) {
            this.id = user.getUserId();
            this.loginName = user.getAccount();
            this.name = user.getUsername();
            this.mobileLogin = mobileLogin;
        }

        public Long getId() {
            return id;
        }

        public String getLoginName() {
            return loginName;
        }

        public String getName() {
            return name;
        }

        public boolean isMobileLogin() {
            return mobileLogin;
        }

        /**
         * 获取SESSIONID
         */
        public String getSessionid() {
            try {
                return (String) UserUtils.getSession().getId();
            } catch (Exception e) {
                return "";
            }
        }

        @Override
        public String toString() {
            return id + "";
        }

    }
}
